Steel plate for stamping and quenching and thermoforming method of steel plate

Abstract

The invention discloses a steel plate for stamping and quenching and a thermoforming method of the steel plate. The steel plate comprises the following chemical components in percentage by weight: 0.14-0.28% of C, less than 0.40% of Si, 0.4-2.0% of Mn, less than or equal to 0.010% of P, less than or equal to 0.004% of S, 0.016-0.040% of Al, 0.15-0.8% of Cr, 0.015-0.12% of Ti, 0.0001-0.005% of B, less than or equal to 0.005% of N, and the balance of Fe and inevitable impurities. The thermoforming method comprises the following steps: blanking by shearing the steel plate, and heating at Ac3 to (Ac3+80) DEG C to carry out austenization; after insulating for 5-10 minutes in the heating furnace, immediately transferring the steel plate to a metal mold the inside of which is cooled by introducing water, and stamping at the high temperature of 650-850 DEG C; cooling the formed workpiece in the closed mold, and cooling the mold by water circulation in the mold, wherein the cooling rate is greater than the critical cooling rate when austenite forms martensite, and the temperature of the workpiece leaving the hot stamping production line is below 150 DEG C; and carrying out air-cooling to room temperature. The steel plate has the advantages of simple component system and favorable hardenability; and the substrate tissues, which are ferrite and pearlite, are processed by hot stamping andquenching to obtain the all martensitic structure. The tensile strength of the steel plate can be higher than 1300 N / mm<2>.

Description

technical field [0001] The invention relates to a steel plate for stamping and quenching and a thermoforming method thereof. The thermoformed product prepared from the steel plate of the invention is mainly used for anti-collision parts and strength reinforcement parts of automobiles. Background technique [0002] In order to improve the effective fuel utilization rate, safety and environmental standards of automobiles, the automobile manufacturing industry is forced to reduce the weight of automobiles and at the same time ensure the safety of collisions, so it is required to increase the strength of parts. The use of ultra-high-strength steel plates is an important way to achieve lightweight vehicles. The biggest problem in using ultra-high-strength steel plates to produce automotive parts at room temperature is the limitation of forming and springback. In the traditional design, most of the parts such as A-pillar, B-pillar, reinforcement plate and anti-collision beam of a...

AI Technical Summary

Problems solved by technology

The steel plate has good hardenability, and the ultra-high-strength structural parts above 1500MPa are produced by hot stamping, which are used for collision parts, support parts and reinforcement parts of automobiles, and solve the problem that the composition of the steel plate in the prior art is relatively complicated, and the smelting and The stamping forming process is difficult to control, the production cost increases and the surface oxidation of thermoformed parts and other problems

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